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Revision 32ffa4f71e10009498ae6b54da65ab316db967bd authored by Axel Rasmussen on 19 May 2021, 20:03:33 UTC, committed by Paolo Bonzini on 27 May 2021, 11:45:55 UTC 
KVM: selftests: compute correct demand paging size
 
This is a preparatory commit needed before we can use different kinds of
backing pages for guest memory.

Previously, we used perf_test_args.host_page_size, which is the host's
native page size (commonly 4K). For VM_MEM_SRC_ANONYMOUS this turns out
to be okay, but in a follow-up commit we want to allow using different
kinds of backing memory.

Take VM_MEM_SRC_ANONYMOUS_HUGETLB for example. Without this change, if
we used that backing page type, when we issued a UFFDIO_COPY ioctl we'd
only do so with 4K, rather than the full 2M of a backing hugepage. In
this case, UFFDIO_COPY returns -EINVAL (__mcopy_atomic_hugetlb checks
the size).

Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Message-Id: <20210519200339.829146-5-axelrasmussen@google.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 parent 25408e5
Raw File
test_bits.c 
// SPDX-License-Identifier: GPL-2.0+
/*
 * Test cases for functions and macros in bits.h
 */

#include <kunit/test.h>
#include <linux/bits.h>


static void genmask_test(struct kunit *test)
{
	KUNIT_EXPECT_EQ(test, 1ul, GENMASK(0, 0));
	KUNIT_EXPECT_EQ(test, 3ul, GENMASK(1, 0));
	KUNIT_EXPECT_EQ(test, 6ul, GENMASK(2, 1));
	KUNIT_EXPECT_EQ(test, 0xFFFFFFFFul, GENMASK(31, 0));

#ifdef TEST_GENMASK_FAILURES
	/* these should fail compilation */
	GENMASK(0, 1);
	GENMASK(0, 10);
	GENMASK(9, 10);
#endif


}

static void genmask_ull_test(struct kunit *test)
{
	KUNIT_EXPECT_EQ(test, 1ull, GENMASK_ULL(0, 0));
	KUNIT_EXPECT_EQ(test, 3ull, GENMASK_ULL(1, 0));
	KUNIT_EXPECT_EQ(test, 0x000000ffffe00000ull, GENMASK_ULL(39, 21));
	KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_ULL(63, 0));

#ifdef TEST_GENMASK_FAILURES
	/* these should fail compilation */
	GENMASK_ULL(0, 1);
	GENMASK_ULL(0, 10);
	GENMASK_ULL(9, 10);
#endif
}

static void genmask_input_check_test(struct kunit *test)
{
	unsigned int x, y;
	int z, w;

	/* Unknown input */
	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, 0));
	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, x));
	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, y));

	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, 0));
	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, z));
	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, w));

	/* Valid input */
	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(1, 1));
	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(39, 21));
}


static struct kunit_case bits_test_cases[] = {
	KUNIT_CASE(genmask_test),
	KUNIT_CASE(genmask_ull_test),
	KUNIT_CASE(genmask_input_check_test),
	{}
};

static struct kunit_suite bits_test_suite = {
	.name = "bits-test",
	.test_cases = bits_test_cases,
};
kunit_test_suite(bits_test_suite);

MODULE_LICENSE("GPL");
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